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86 lines
2.0 KiB
TypeScript
86 lines
2.0 KiB
TypeScript
// Loaded from https://deno.land/x/oak/mediaTyper.ts
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/*!
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* Adapted directly from media-typer at https://github.com/jshttp/media-typer/
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* which is licensed as follows:
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*
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* media-typer
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* Copyright(c) 2014-2017 Douglas Christopher Wilson
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* MIT Licensed
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*/
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const SUBTYPE_NAME_REGEXP = /^[A-Za-z0-9][A-Za-z0-9!#$&^_.-]{0,126}$/;
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const TYPE_NAME_REGEXP = /^[A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126}$/;
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const TYPE_REGEXP =
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/^ *([A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126})\/([A-Za-z0-9][A-Za-z0-9!#$&^_.+-]{0,126}) *$/;
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class MediaType {
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constructor(
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/** The type of the media type. */
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public type: string,
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/** The subtype of the media type. */
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public subtype: string,
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/** The optional suffix of the media type. */
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public suffix?: string,
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) {}
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}
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/** Given a media type object, return a media type string.
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*
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* format({
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* type: "text",
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* subtype: "html"
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* }); // returns "text/html"
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*/
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export function format(obj: MediaType): string {
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const { subtype, suffix, type } = obj;
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if (!TYPE_NAME_REGEXP.test(type)) {
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throw new TypeError("Invalid type.");
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}
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if (!SUBTYPE_NAME_REGEXP.test(subtype)) {
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throw new TypeError("Invalid subtype.");
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}
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let str = `${type}/${subtype}`;
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if (suffix) {
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if (!TYPE_NAME_REGEXP.test(suffix)) {
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throw new TypeError("Invalid suffix.");
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}
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str += `+${suffix}`;
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}
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return str;
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}
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/** Given a media type string, return a media type object.
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*
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* parse("application/json-patch+json");
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* // returns {
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* // type: "application",
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* // subtype: "json-patch",
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* // suffix: "json"
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* // }
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*/
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export function parse(str: string): MediaType {
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const match = TYPE_REGEXP.exec(str.toLowerCase());
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if (!match) {
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throw new TypeError("Invalid media type.");
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}
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let [, type, subtype] = match;
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let suffix: string | undefined;
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const idx = subtype.lastIndexOf("+");
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if (idx !== -1) {
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suffix = subtype.substr(idx + 1);
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subtype = subtype.substr(0, idx);
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}
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return new MediaType(type, subtype, suffix);
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}
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